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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 17, Iss. 12 — Dec. 1, 2000
  • pp: 2068–2080

Sub-Doppler spectroscopy of the C—O stretching fundamental band of methanol by use of microwave sidebands of CO2 laser lines

Zhen-Dong Sun, Fusakazu Matsushima, Shozo Tsunekawa, and Kojiro Takagi  »View Author Affiliations

JOSA B, Vol. 17, Issue 12, pp. 2068-2080 (2000)

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Microwave sidebands of CO2 laser lines were used in a sub-Doppler spectrometer to observe sub-Doppler spectrum of the C—O stretching fundamental band (vCO=1←0) of methanol. Frequencies of more than 200 vibration-rotation lines were measured with an accuracy of better than 0.20 MHz. Sixty-one blended spectral lines in the Fourier-transform spectrum were resolved with a resolution of 0.2 MHz. For transitions involving A-species levels with K=2, 3, and 4 in the vt=0 state and K=2 in the vt=1 state, 64 doublet lines arising from asymmetry splittings were observed. From these observed asymmetry splittings and calculated ground-state splittings the asymmetry splittings and asymmetry-splitting constants for the vCO=1 state were determined. The R- and Q-branch transitions for the (vt, E, K)=(1, E, 2) and (1, E, 5) sequences were assigned by observation of their Stark effects and by use of the Ritz’s combination principle. Term values of the levels in the vCO=1 state for these two sequences were given, and their Taylor-series expansion coefficients were determined.

© 2000 Optical Society of America

OCIS Codes
(300.6190) Spectroscopy : Spectrometers
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6360) Spectroscopy : Spectroscopy, laser
(300.6390) Spectroscopy : Spectroscopy, molecular
(300.6460) Spectroscopy : Spectroscopy, saturation

Zhen-Dong Sun, Fusakazu Matsushima, Shozo Tsunekawa, and Kojiro Takagi, "Sub-Doppler spectroscopy of the C—O stretching fundamental band of methanol by use of microwave sidebands of CO2 laser lines," J. Opt. Soc. Am. B 17, 2068-2080 (2000)

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